If your rough times are related to bow building, you are taking on a complicated task. You may want to try for another bow wood and/or simpler design until you are comfortable with the whole bow building process. No since setting yourself up with the possibility of more frustrations, especially when making a bow, and birthday present for some one else.
I'm not trying to discourage you. The bow you are talking about making is quite doable. Maybe someone else will have an answer that will be more acceptable to you.